Measured-quantity-control device



' Aug. 25, 1925. 1,550,972

. w. u.. LAUDAN MEASURED QUANTITY CONTROL DEVICE Filed July 31. 1924 2g.My l.

W nv muli' et., claanialnjmt,

Patented Aug. 25, 1925. I

UNITED STATES' issuers PATENT OFFICE.

WILLIAM L. LAUDAN, 0F STERLING, COLORADO.

MEASURED-QANTITY-CONTROL DEVICE.

Application filed July 31, 1924. Serial No. 729,380.

To all whom 'zit may concern:

Be it known that I, WILLIAM L. LAUDAN, a citizen of the United States,residing at Sterling, county of Logan, and State o-f Colorado, haveinvented cert-ain new and useful Improvements in Measured-QuantityControl Devices; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the characters ofreference marked thereon, which form a part of this specification.

This invention relates to a predetermined-- quantity control device orpump, which is operated by the varying pressure within a chamber, andwhich delivers liquid in measured quantities to any desired place.

It is the object of this invention to produce a simple device that canbe connected to the explosion chamber of an internal combustion engineor to the cylinder of an air compressor, which will function as a pumpfor transferring a liquid or other fluid from one container to another.

Another object of this invention is to produce a device that shall beadapted to transfer lubricating oil from an oil cup to the inside of anengine or air pump cylinder in Such a manner that oil willenterconstantly in measured quantities, ,thereby assuring constantlubrication.

Many attempts have been made to properly lubricate the cylinders of aircompressors. With the exception of some complicated force feedmechanism, however, no satisfactory lubricating device for aircompressors has been discovered.

My invention can be most clearly de scribed and will be most readilyunderstood when reference is had to the accompanying drawing, in whichthe preferred embodiment thereof is illustrated, and in which:

Fig. 1 is a diagrammatic, sectional View showing my `improved pumpattached to an internal combustion engine or air pump cylinder;

Fig. 2 is a view showing the device connected to an air pump or enginefor delivering lubricating oil to the same;

Fig. 3 shows my device applied to an oil cu gig. 4 shows an oil cupprovided with a slightly modified form of my invention; and

Fig. 5 is a section taken on line 5 5, Fig. 2.

Numeral 1 designates a cylinder and 2 the reciprocating piston, whichlis operatively associated therewith. A pipe 3 is connected with thecylinder and extends to the pump s. This pump consists of a body member5 having two spaced, preferably parallel openings 6. These openings havetheir ends 7 of somewhat larger diameter at the point where the opening6 connects with the openings 7. Annular shoulders 8 are formed, whichare preferably chamfered or inclined so as to form valve seats. Theupper enlarged chamber 7 on one side is connected to the lower enlargedchamber 7 on the other side by a channel 9. Seated within each opening 6is a double ended valve having valve portions 10 connected by a stem 11.The valve portions l0 are adapted to cooperate with the seats 8, but thestems l1 are of such length that only one valve .can seat at a time. Thestems are also of` smaller diameter than the openings G so that liquidcan flow through the opening while the stem is in place. In order topermit `the valves to be assembled in the manner shown, the stems aremade in two parts and threadedly connected. Plugs 12 are threaded intothree of the chambers 7. The plugs in the upper chambers have adjustingscrews 13 associated therewith. These screws engage a cup 14, againstwhich the upper end of the spring 15 abuts. Vhen it is desired 4toincrease the tension of the springs, the screws 13 are turned inwardly.This compresses the spr' g so that it requires greater force to unseatthe valve. ik pipe 16 leads to the supply 17 and a second pipe 18 leadsto the reservoir 19.

It is evident that if the piston 2 moves downwardly there will be adiminution of pressure within the cylinder. When the difference in thepressure within the cylinder and that of the circumambient air becomessufliciently great, it will raise the valve 10 on the left of the pump(Fig. 1) and permit liquid to flow upwardly into the upper chamber 7. Asthe suction and the flow of liquid increases, the valve will closeagainst the lower seat, which, of course, stops the flow. -When thepiston returns, it will compress the fluid in the cylinder, but beforeany compression takes place, the pressure will approach atmospheric. Atsome point between the condition of suction and compression within thecylinder, the spring 15 moves the valve to `the position shown in thedrawing. Vhen the pressure becomes sufficiently great the fluid orliquid will unseat the valve on the right (Fig. 1) and enter the pipe18. As the pressure within the cylinder changes from below the aboveatmospheric, the above operation will be repeated, with the result thata liquid will be transferred from 17 to 19. It is evident that untilthere has been sufficient oil raised from the supply 17 to till thepassage 9 and associated chambers 7 that pressure should not beadmitted, since it will only cause air to enter the pipe 1S. At the sametime, it the liquid should enter the pump faster than it can leave it,the liquid would soon accumulate and enter the pipe B. To prevent this,I have provided a 'float chamber 20 directly above the pump 4l..

This chamber contains a float 2l., which controls two valves 22 and 23.Then the iioat chamber is empty, the valve 23 is closed, but when it isfull the valve 22 is closed, while at some intern'iediate point bothvalves are open. The float operates to prevent air under pressure 'fromentering the pump until the latter has been completely filled and theliquid has risen suliiciently in the float chamber to raise the float.It', for any reason, more liquid should be sucked into the pump than canleave, then the {ioat will finally rise sufliciently to close valve 22,which will effectively prevent more liquid 'from entering until thelevel in the iioat chamber has fallen. The ioat will therefore serve tokeep the pump full ot' liquid at all times and to prevent liquid fromentering the cylinder. Although I have shown the valve in the righthandopening 6 as a double one, this is not absolutely necessary, as thelower valve portion may be dispensed with without changing the operationto any great extent. It the riglrthand valve is single instead ofdouble, there will be very little danger of liquid accumulating in thepump.

Vhen my device is to be used for supplying a lubricant to a cylinder, asomewhat simpler device than that described may be employed. Thissimpliied device is shown in Fig. 2, in which the pump is indicated bynumeral 4A. The part 5 may be a cylindrical bar provided with a centralaxial opening 6A having enlarged chambers 7A at its ends. The pump hasonly a single double ended valve member, which is constructed and whichfunctions exactly like the one shown on the right of the pump in Fig. 1.The parts have been designated with the same numerals as correspondingparts in Fig. 1, each numeral having an A attached to indicate that theyrepresent specifically different parts.

When the portion 2 reciprocates, it produces a suction on its downwardstroke. This causes oil to iow from the supply 17. Only a limited amountof this oil will pass the valve on each stroke, as the valve seatsagainst the lower valve seat a short interval ot time after it opens.The length of time the passage past the valve is open depends somewhatupon the length of the valve and the tension of the spring 15, one orboth of which must be altered until the desired results are obtained.

ln Fig. 3 l have shown my improved pump incorporated into an oil cup,which has a cup portion 2st having an internally threaded downwardlyprojecting nipple 25 that is connected to the cylinder 1 by means ot apipe 2G. The cup has a cover 2T provided with an opening 28. Within thecup .l place my improved control device consisting of a body member 29,which has a tubular threaded end 3() that is threaded into the nipple25. The opening 31 is connei-ted by means ot a transverse opening withthe enlarged chamber 33, which is connected by an opening 34 with asecond enlarged chamber 35. The shoulders at the ends oi the opening 34;are provided with beveled valve seats 36, which cooperate with a doubleended valve constructed like those previously described. A screen 37closes the end ot' the chamber 35 and prevents dirt from entering. Theaction of this device is exactly the same as explained in connectionwith Fig. 2.

ln Fig. 4 l show a slight modiiication. In my control device isincorporated the part :38 that conne-cts the nipple 25 with thecylinder. Member 38 is constructed almost exactly like that shown inFig. 2 and dit ters from it principally in this, that the spring 39 isunder tension instead of under compression. The upper end of the springis connected to a threaded pin 40 that passes through a support 41 that.is threadedly secured to the end of member 38. A nut 4:2 cooperates withthe pin 40. This device operates in precisely the same way as thoseshown in Figs. 1 and 2 and differs merely in this, that the spring isunder tension instead of under compression.

Although I have described the above invention as being particularlyadapted for use in connection with the lubrication ot air compressorsand have employed language that might imply that there mustbe avariation in pressure which changes from above to below atmospheric, Iwant it understood that my device may be used in connection with steamengines both of the condensing and uncondensing type, as the onlyrequirement is that the pressure in the supply reservoir 17 shall begreater than the minimum pressure in the cylinder so that oil Will flowupwardly through the check valve opening on the left (Fig. l).

It the supply reservoir is subjected to pressure, the tension ot thespring will have to be suliicient to hold the valve seated in spite ofthe same.

It will be apparent from the above description that I have invented asimple device that is especially well adapted to 1ubricate the cylindersof air compressors and other machines where there is a chamber which issubjected alternately to pressures above and below atmospheric. When mydevice is constructed in the manner shown in Fig. l, it can be used fora variety of purposes, but is especially well adapted tor use inconnection with internal combustion engines for circulating oil and canbe substituted Jfor the ordinary oil pump. In connection with automobileengines having a splash Voiling system, my device can-readily be appliedfor the purpose oit' producing a positive circulation of oil, which willprevent damage in case the gravity circulation shall become inoperativefor any reason.

l/Vhen constructed as shown in Figs. 3 and 4l the oil cups may beattached directly to an engine cylinder as readily as any simple oil cupand will provide positive constant lubrication.

Having now described my invention, what I claim as new is:

1. A pump tor transferring liquid, comprising, in combination, a bodymember having two spaced openings having portions thereof of differentdiameters, a pair of spaced valve seats formed in said openings at thepoint where the diameters change, a valve member for each of saidopenings, said valve members being each provided with two spaced valveportions adapted to cooperate with said valve seats, said valve being ofsuch length that it can contact with only one valve seat at a time,resilient means associated with each valve member for normally holding avalve portion against one of said valve seats, and means for connectingthe enlarged portion of each of said openings containing respectivelythe normally open and the normally seated valve, with a chamber having apressure variation from belo-w to above atmospheric.

2. A pump for transferring liquid, comprising, in combination, a bodymember having two spaced openings having portions thereof of differentdiameters, a pair of spaced valve seats formed in said openings at thepoint where the diameters change, a valve member for each of saidopenings, said valve members being each provided with two spaced valveportions adapted to cooperate with said valve seats, said valve being ofsuch length that it can contact with only one valve seat at a time,resilient means associated with each valve member for normally holding avalve portion against one of said valve seats, and means tor connectingthe enlarged portion of each of said openings containing respectivelythe normally open and the normally seated valve, with a chamber having apressure variation from below to above atmospheric, said meanscomprising a float valve adapted to close one of two openings.

In testimony whereof I atlix my signature.

WILLIAM L. LAUDAN.`

